Stop mechanism for twisters and the like



Dec. 9, 1924- 1,518,720

H. WILKINSON STOP MECHANISM FOR TWISTERS AND THE LIKE Filed June '4,19,23

Patented Dec. 9, 1924.

UNITED STATES PATENT OFFlaCE.

HARRY W ILKINSON, OF METHUEN, MASSACHUSETTS, ASSIGNOR T0 SACO-LOWELLSHOPS, 0F BOSTON, MASSACHUSETTS, A CORPORATION OF MASSACHUSETTS.

STOP MECHANISM FOR TWISTERS AND THE LIKE.

Application filed June 4,

To all whom it may concern:

Be it known that I, HARRY TVI KWSON, a citizen of the United States,residing at Methuen, county of Essex, State of Massachusetts, haveinvented a certainnew and useful Improvement in Stop Mechanis forTwisters and the like, of which the followin is a specification,reference being had therein to the acompanyingdrawings.

This invention relates to twisting or-spinning frames or the like'inwhich the strands or yarns to be spun or twisted are drawn from reels orother suitable sources of supply by means of delivery rollers from whichsaid strands or yarns pass to the spindles. The delivery rollers andspindles are rotated at different rates of speed bearing a predeterminedratio to one another in order to determine the tightness of twist. Insuch machines, it is customary and desirable to employ a suitable stopmechanism for arresting the rotation of a delivery roller in the case ofbreakage of one or more of the strands or yarns passing therefrom to thecorresponding spindle, in order to prevent the waste of material causedby fur ther drawing of yarn from the source of supply bythe roller andconsequent wrapping of the same about the latter. {A form of stopmechanism for this purpose, now quite generally employed in machines ofthis type, is shown in Letters Patent No. 753,338,'granted March ,1,1905, on an application filed by Channing Whitaker. The stop mechanismshown in said patent is controlled by a pivoted arm or lever having atits end an eye through which the yarns are guided in their passage fromthe delivery roller to the spindle, the yarns above and adjacent theguide eye occupying a position which is oblique to the pivoted arm, thelater being held in a depressed position by the tension of said yarns.The operation of the device depends upon a very delicate balance of thepivoted arm, which is provided with a weight longitudinally adjustablethereon in order to control the balance. It is found in practice thatthis necessary delicate balance is quite easily upset, the jarring ofthe frame being); suflicient to loosen the adjustable weight and move itout of its adjusted position, thereby disarranging the mechanism so asto cause the same to operate at improper times orto fail to operate whenit should,

1923. Seriafl No. 643,199.

and resulting in a considerable waste of material and loss of the timeof the attendantin readjusting the parts.

The present invention has for its object to obviate the difiicultieslast referred to and to provide improved means for controlling the stopmechanism, which means are not dependent for their operation upon anydelicate balance between the tension of the yarns and an adjustableweight.

The foregoing and other objects of the invention, together with meanswhereby the same maybe carried into effect, will best be understood fromthe following description of one form or embodiment thereof illustratedin the accompanying drmvings, in which:

Fig. 1 is a fragmentary side elevation of one unit of a spinning ortwisting frame provided with a stop mechanism control constructed andarranged in accordance with the invention.

Fig. 2 is a section taken substantially on the line 2-2, Fig. 1.

In the drawings is shown one unit of a twister frame having longitudinalrails 10, 11, 1'2 and 13 by which the respective parts of the severalunits and the actuating mechanism therefor are carried. The spindles 15journalled in the rail 10 are provided with the usual caps 16 and arerotated at a predetermined speed by suitable driving connection, notshown, which may be of any usual and well-known form. The strands oryarns 17 are drawn from suitable sources of supply, not shown, bydelivery rollers 18 disposed with their axes vertical, said yarns"passing to and from said rollers through suitable guides 19 and 20supported on the rail 13. The yarns pass to each spindle 15 through aguide eye 21 carried by the end of an arm or lever 23 pivoted orfulcrumed at. 24 upon a bracket or upright 25 secured to the rail 11.Each delivery roller 18 is carried by an upright spindle or shaft 26journalled in a yoke 27 and provided with a worm gear 28 whichcooperates with a worm 29 on a shaft 30 extending longitudinally of themachine. The yoke 27 is provided with trunnions 31 by which said yoke ispivotally connected with a bracke' 32 supported by the rail 12, saidyoke being so balanced as normally to tend to swing the gear 28 out ofmesh with the worm 29. The parts are normally held in the positionshown, with the gears 28, 29 engaged, by means of a latch 33 pivoted at3a to the rail 12 and engaging an arm 9 on said yoke. The arm 9 isformed with a downwardly turned end 35 which is engaged by the upwardlyturned end 36 of the lever 23 when the forward end of said lever isdepressed to swing the yoke 27 and move the gear 28 into mesh with theworm 29. Pivoted' to the latch 33 is a trip 37 which is normally held,by means hereinafter described, in the position shown in the drawings,but which, when released, is adapted to swingby gravity into the path ofmovement of radially projecting pins 38 on the hub 39 of the ear 28.When this occurs, the trip 37 is engaged by one of the pins 38, whichacts through said trip to swing the latch 33 out of engagement with thearm 9, thereby permitting the yoke 27 to swing outwardly and disengagethe gears 28 and 29. i

The parts thus far referred to may be substantially as shown anddescribed in the patent to Whitaker, above referred to, or otherwise asmay be preferred. i

In accordance with the present invention the trip 37 is controlled by adrop wire 40 guided for longitudinal vertical movement in a bushing 41carried by a fixed bracket 42 secured to the rail 12. As herein shown,the yarns17 between the guides 20 and 21 pass over an additionallongitudinally disposed guide rod or roller 43 between which and theguide 20 the said yarns extend in a straight, approximately horizontalstretch. The drop wire 40 is formed with a hooked upper end 4A whichrests by gravity on said approximately horizontal stretch of said yarn.At its lower end, the drop wire 40 is bent at substantially right anglesto form an angularly offset arm 45 which is guided in a slot 46 in thebracket 42 and engages an arm 47 on the trip 37.

In operation, when the strands or yarns 17 are intact, the drop wire 40is supported thereby in the position shown in the drawings, and the trip37 is therefore held out of the path of movement of the pins 38. Shouldthe yarns 17 or either of them break, said drop wire is permitted tomove downwardly under the influence of gravity, thereby permitting saidtrip to swing into a position to be engaged by one of the pins 38 andcausing the stop mechanism to operate to disengage the gears 28 and 29and stop the delivery roller 18, as above described. When the brokenyarn is replaced, the drop wire 40 is again raised and hooked thereover,whereupon the forward end 21 of the latch 23 is depressed to cause therear end thereof to engage the end of the arm 9, and swing the gearsinto engagement, the latch 33 being so weighted as to swing by gravityinto position under the arm 9, thereby holding the parts in the positionshown. 2

It will be seen that the mechanism described is such as to cause thestop mechanism always to act when, but only when, the yarn breaks, beingnot dependent for its operation upon any delicate balance of parts whichmay he accidentally displaced under the influence of the jarring of theframe or otherwise.

Having thus described my invention, I claim 1. In a twisting frame orthe like, in combination, a spindle, a delivery roller, mechanism fordriving said roller, a stop mechanism therefor, a pivoted arm forresetting said driving mechanism when disconnected by said stopmechanism, means including an eye carried by said arm for guiding theyarns from said roller to said spindle, and means independent of saidarm and controlled by the yarns for controlling said stop mechanism.

2. In a twisting frame or the like, in combination, a spindle, adelivery roller, mechanism for driving said roller, a stop mechanismtherefor, a pivoted arm for resetting said driving mechanism whendisconnected by said stop mechanism, means includingan eye carried bysaid arm for guiding the yarns from said roller to said spindle, and adrop wire resting by gravity on a substantially straight stretch of saidyarns and operatively connected with said stop mechanism t vcontrol thesame.

3. In a twisting framleor the like, in combination, a spindle, adelivery roller, driving devices for said roller, a latch for holdingsaid driving devices in operative engagement, means including a trip forreleasing said latch to cause disengagement of said devices and stopsaid roller, and a drop wire supported by the yarns between said rollerand spindle and operatively connectedwith said trip to control the same.

4. In a twisting frame or the like, the combination with a spindle, adelivery roller and a stop mechanism for said roller, of a drop wiresupported by the yarns between said roller and spindle and operativelycon-- nected with said stop mechanism to control the same, and a fixedguide in which said drop wire is longitudinally and vertically movable.

' 5. In a twisting frame or the like, in combination, a spindle, adelivery roller, driving devices for said roller, a pivoted arm formovingsaid devices into operative engagement, a latch'for holding saiddevices in operative engagement, means including a trip for releasingsaid latch to cause disengagement of said devices and stop; said roller,means including an eye carried by said arm and an additional guideforguiding the yarns from said roller to said spindle and holding astretch thereof in an approximately horizontal position, a drop wireresting by gravity upon the approximately horizontal stretch of saidyarns and operatively connected with said trip to control the same, anda fixed guide in which said drop wire is longitudinally and verticallymovable.

6. In a twisting frame or the like, in combination, a spindle, adelivery roller, driving devices for said roller, a latch for holdingsaid driving devices in operative engagement, means including a trip forreleasing said latch to cause disengagement of said devices and stopsaid roller, a drop wire supported by the yarns between said roller andspindle and having an angularly offset arm connected with said trip, anda fixed bracket 15 in which said drop wire is longitudinally andvertically movable, said bracket having a slot in which said offset armis guided.

In testimony whereof I aflix my signature.

HARRY WILKINSON.

